So just technicalities:
Not only that you can run through the "trenches" by the yellow plate. But you can just jump the gap without the cube.
About advanced throw in the "first level" you can just simple throw the cube from the nearest point (stairs), which completely bypass the advanced throw, which I discovered just in the first sentient level.
Best use of cube against rockets it throwing it at them - no need for sentience or magnetism. And rocket launchers are weird, sometimes they shoot, sometimes they don't.
The last use of magnetism (in the ceiling) can also be just thrown, which completely ruins the idea.
The invisible luck is a really low and should be like tripled. Also any Chance is boring in a grind, so a mechanic to roll the cube in your hands would be totally perfect. Just a big random shake to have it rotate in your hands rather than by a wall which takes like 5x more time.
Also be careful with the blue walls they didn't stretched everywhere they should have.
Anyway it was a pretty good game with a lot of going on but the mechanics would need just a little bit a polishing (that you just don't get in game jams). Hope you keep up the good work :)